Where is Grindstone Lake?

Grindstone Lake is a lake in Pine County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.

How deep is Grindstone Lake?

Grindstone Lake has a maximum depth of 153 feet. The lake covers 525 acres.

Grindstone Lake

Pine County, Minnesota525 acresView map Directions

No nutrient or algae sampling on record from Minnesota PCA for this lake.

Max depth

153 ft

Bathymetric survey

Area

525 acres

Surface area

Shoreline

4.8 mi

Measured length

Impaired · Mercury
153 ft max depth

See the measurements Directions Where to stay

Grindstone Lake in Pine County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 153 ft. Surface area: 525 acres.

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Grindstone Lake is a 525-acre lake in Pine County, Minnesota with a maximum depth of 153 feet.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder. Methodology: how these readings are compared.

What Grindstone Lake is good for

From access and monitoring records, not editorial picks.

Deep water153 ft surveyed max depth

Swimming conditions

No reading

Recreation use not supported

Nutrient and algae readings are not a swimming clearance. Grindstone Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, nutrients (phosphorus, nitrogen). Check local advisories before you swim.

Whether Grindstone Lake is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Grindstone Lake

These are the measurements Minnesota PCA publishes for Grindstone Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

No clarity data. TSI undefined.

Ask about Grindstone Lake

Answers come straight from the public measurements and survey records on this page.

Lake Details

Max depth

153 ft

Surface area

525 acres

Shoreline

4.8 mi

The depth above comes from a bathymetric survey of this lake, not from a regional estimate.

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Stays near Grindstone Lake

Compare lakeside cabins, hotels, and vacation rentals near Grindstone Lake in Pine County, Minnesota — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near Grindstone Lake

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Fishing Grindstone Lake

→ Grindstone Lake fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Grindstone Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

MercuryNutrients (phosphorus, nitrogen)

Designated uses not supporting: Fish consumption, Recreation.

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MN58-0123-00 · Official waterbody report

Nearby Lakes in Pine County

Elbow Lake2.8 miView →Grass Lake3.3 miView →Bass Lake8.3 ft clear3.2 miView →Hellmans Lake4 miView →Upper Pine Lake—View →Miller Lake4.2 miView →

Frequently asked questions about Grindstone Lake

Where is Grindstone Lake?: Grindstone Lake is a lake in Pine County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Grindstone Lake?: Grindstone Lake in Pine County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Maximum depth: 153 ft. Surface area: 525 acres.
Is Grindstone Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Grindstone Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Grindstone Lake?: Grindstone Lake has a maximum depth of 153 feet. The lake covers 525 acres.